Adsorption and Diffusion Moderated by Polycationic Polymers during Electrodeposition of Zinc

Tietcha, Gastelle F, Mears, Laura LE ORCID: 0000-0001-7558-9399, Dworschak, Dominik, Roth, Marcel, Kluppel, Ingo and Valtiner, Markus (2020) Adsorption and Diffusion Moderated by Polycationic Polymers during Electrodeposition of Zinc. ACS APPLIED MATERIALS & INTERFACES, 12 (26). pp. 29928-29936.

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Official URL: http://dx.doi.org/10.1021/acsami.0c04263

Abstract

Electrodeposition of metals is relevant to much of materials research including catalysis, batteries, antifouling, and anticorrosion coatings. The sacrificial characteristics of zinc used as a protection for ferrous substrates is a central corrosion protection strategy used in automotive, aviation, and DIY industries. Zinc layers are often used for protection by application to a base metal in a hot dip galvanizing step; however, there is a significant interest in less energy and material intense electroplating strategies for zinc. At present, large-scale electroplating is mostly done from acidic zinc solutions, which contain potentially toxic and harmful additives. Alkaline electroplating of zinc offers a route to using environment-friendly green additives. Within the scope of this study an electrolyte containing soluble zinc hydroxide compound and a polyquarternium polymer as additive were studied during zinc deposition on gold model surfaces. Cyclic voltammetry experiments and in-situ electrochemical quartz crystal microbalance with dissipation (QCM-D) measurements were combined to provide a detailed understanding of fundamental steps that occur during polymer-mediated alkaline zinc electroplating. Data indicate that a zincate-loaded polymer can adsorb within the inner sphere of the electric double layer, which lowers the electrostatic penalty of the zincate approach to a negatively charged surface. X-ray photoelectron spectroscopy also supports the assertion that the zincate-loaded polymer is brought tightly to the surface. We also find an initial polymer depletion followed by an active deposition moderation via control of the zincate diffusion through the adsorbed polymer.

Item Type:	Article
Uncontrolled Keywords:	electroplating, corrosion protection, polyamine, polymer additive, electrochemical QCM-D
Divisions:	Faculty of Science and Engineering > School of Physical Sciences
Depositing User:	Symplectic Admin
Date Deposited:	10 Sep 2021 14:40
Last Modified:	18 Jan 2023 21:28
DOI:	10.1021/acsami.0c04263
Open Access URL:	https://doi.org/10.1021/acsami.0c04263
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3136652